Powder Spreading Unit With Linear Feed Control for 3D Printing
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Solution Overview
Problem
Existing 3D printers face issues with powder spreading accuracy due to dust accumulation in the powder spreading unit, leading to reduced precision and efficiency.
Innovation Solution
A powder spreading device with an intermediate powder supply system and a powder spreading unit that allows for controlled movement of preformed powder through rollers and scrapers, eliminating the need for precise angle control, and incorporating a collection system to manage surplus powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the incline angle of the powder spreading unit is controlled to regulate powder quantity, then the powder spreading accuracy is improved, but the installation accuracy requirement of the connection bearing increases and the device complexity increases
Solution Approach 1:
The patent changes the control parameter from incline angle to horizontal movement distance. The powder supply unit moves horizontally along the guide rail by a controlled distance to regulate the amount of powder supplied, eliminating the need for precise angular control of connection bearings while maintaining powder spreading accuracy.
2Ease of operation
If the incline angle control method is used, then the powder quantity can be regulated, but the device structure becomes more complex and installation difficulty increases
Solution Approach 1:
The patent replaces the mechanical incline angle adjustment system with a horizontal linear movement system. A motor drives the powder supply unit along a guide rail, substituting complex angular mechanical adjustments with simple linear motion control, thereby reducing installation difficulty and improving ease of operation.
3Reliability
If dust enters the connection bearing structure, then the reliability of the powder spreading unit decreases, but this is a consequence of the operating environment rather than design
Solution Approach 1:
The patent extracts the powder supply unit from the dusty environment by separating the powder supply chamber from the powder spreading mechanism. The powder is supplied through a closed channel system, preventing dust from entering the connection bearing and other sensitive components, thereby maintaining reliability.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A powder spreading device includes a forming box, an intermediate powder supply device, and a powder spreading unit. The intermediate powder supply device includes a powder supply base and a powder supply unit. The powder supply base defines a first powder inlet passage, a second powder inlet passage, a first powder outlet passage, a second powder outlet passage, and a first receiving space. The first powder inlet passage is configured to receive a first preformed powder. The second powder inlet passage is configured to receive a second preformed powder. The first receiving space is configured to receive the powder supply unit. The powder supply unit is configured to move along a first direction one or more times to transfer the first preformed powder from the first powder inlet passage to the first powder outlet passage, and move along the second direction one or more times to transfer the second preformed powder from the second powder inlet passage to the second powder outlet passage. The powder spreading unit includes a scraper. The scraper is configured to smooth the first preformed powder or the second preformed powder. Thus, a quantity of the powder during spreading can be accurately controlled.